#!/usr/bin/perl --
use strict; use warnings;
use Data::Dump qw/ dd /;
use File::Find::Rule qw/ find rule /;
my $startdir =  'file-find-rule-mindepth-maxdepth';
my @files = find(
    file     => name => qr/\.txt$/i,
    mindepth => 2,
    maxdepth => 2,
    in       => $startdir,
);
dd( \@files );

__END__
$ findrule file-find-rule-mindepth-maxdepth
file-find-rule-mindepth-maxdepth
file-find-rule-mindepth-maxdepth/6.txt
file-find-rule-mindepth-maxdepth/a
file-find-rule-mindepth-maxdepth/q
file-find-rule-mindepth-maxdepth/q/6.txt
file-find-rule-mindepth-maxdepth/q/r
file-find-rule-mindepth-maxdepth/q/r/5.txt
file-find-rule-mindepth-maxdepth/q/s
file-find-rule-mindepth-maxdepth/q/s/7.txt
file-find-rule-mindepth-maxdepth/x

$ perl file-find-rule-pimperator.pl
["file-find-rule-mindepth-maxdepth/q/6.txt"]